Welcome to the show
After a quick glance I think that the dependencies for wireshark are missing.
When you install packages through rpm you normaly have to solve the dependencies for yourself. Either try to install the packages stated in the front window through rpm or use the package manager of Red Hat. Depending on the version you are running you can use "up2date" (RH4) or "yum" (RH5).
Here is a rough walkthrough
up2date --show-available | grep wireshark
This shows which packages are available and greps the output for wireshark
up2date --dry-run -i wireshark
The --dry-run options lets you review the steps up2date would take to -i (install) the package
If all good
up2date -i wireshark
Easiest with yum
yum install wireshark
When i recall right it show you what it's about to do and you just have to fill in y to get wireshark installed.
One of the above meethod should do the trick. Else just check back.